单项选择题
A.28/198277845 B.DHF32872374 C.528244237 D.2387485046
A.DSDF HU/901 B.DHF32872374 C.528244237 D.KJDIF-273
A.真空整流器 B.真空整流器<br> INVAC RECTIFIER C.真空整流器<br> INVAC RECTIFIER KBU7K D.真空整流器<br> KBU7K